Post-type arc-lamp.



G. M. LITTLE.

POST TYPE ARC LAMP.

APPLICATION vFILED verm. |913.

Patented Apr. 301918.'

WITNESSES:

GERGE M. LITTLE, 0F PITTSURGH, PENNSYLVANIA, ASSGNOR T0 WESTINGHGUSE ELECTRIC AND MANUFACTURING CGMPNY, A. CORPORATION OF PENNSYLVANIA,

roer-TYPE anc-LAM?.

Specification of Letters Patent. Y Ptgnmdl App, 3G, 1191 Application filed December t, V1913. Serial No. 804,655.

T0 all whom t may concern:

Be it known thatl, Gnonen M. LITTLE, a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful improvement in Post-Type Arc-Lamps, of which the following is a specification.

VMy invention relates to arc lamps, and it has special reference to supporting structures for arc lamps.

My invention refers particularly to arc lamps which are adapted to be mounted upon posts or pedestals, and it has for its object to provide supporting structures there for that will permit inspections of the lamps and the necessary replacements to be readily made, and will allow of a weather proof design.

At present, it is usual to support an arc lamp upon a post or pedestal by suspending the lamp between the arms of a bifurcated or forked member whichresults in the casting of Aundesirable shadows because of light flux from the lamp 'being' intercepted by the supporting arms. character above mentioned, or so-called lyre typev lamp, requires a special construction to adapt it for suspension from the supporting arms, and, in order that the lamp may have a pleasing appearance, 1t 1s essential to provide an expensive structure which prevents common use of this type of lamp.

By means of my invention, an arc lamp of a standard form of construction may be employed for a post mounting which insures a substantial support for the lamp and at the same time eliminates the objectionable heavy supporting arms above mentioned. My invention also provides a simple and inexpensive structure by means of which all portions of the lamp are made readily aci,

cessible, whereby inspections and replacements-may be eiiiciently and expeditiously made.

For a better understanding of the nature, the scope and the characteristic features of my invention, reference may be had to the following description and the accompanying drawing of which Figure l is a view, partially in elevation and partially in section, of an are lamp embodying a form of my invention, Fig. 2 is a cross sectional view taken on the line lll-ll of Fig. l, Fig. 3 is a plan view of the lamp-supporting ring which, is

Again, the lamp of the shown in Fig. l, and Fig. 4lis an enlarged detail view partially in section, of a portion of the device shown in Fig. 1.

A lamp l of a standard form of construc tion engages an annular member 2 which is Y supported by rigid members 3 that, in turn,

are supported by an element 9 seatedin the upper portion of a post 4f. The supports 3 are positioned eXteriorly to an inner globe 5 and are contained in an outer globe 6 which substantially surrounds the inner globe 5. ln order to replace the carbone at the end of a trim, it is necessary to have access to them and, to this end the lamp is raised by means of pivo'ed arms 7 and a sliding sleeve 8 to a position indicated by the broken lines of Fig. l. When the lamp occupies the latter position, the inner globe 5 may be easily removed, thereby permitting the burned electrodes tobe replaced by new electrodes.

As shown in Fig. l, the lamp is disposed upon the ring 2 which sustains the lamp in its normal position by reason of the supporting members 3 being cast in a stationary element 9 of the post 4f. The outer globe 6 supports none of the weight of the lamp but is designed to engage, at its upper edge, an imperforate ring secured to the base of a condenser 10, and, atits lower edge, a flanged portion ll of the post 4:, the said globe providing a dead air space l2 which is cut 0H from communication with the outer air and with the chamber of the condenser 10. linasmuch as the supports 3 are comparatively small in diameter, they intercept only Va small portion of the light flux emanating from the lamp and, consequently, the shad ows resulting therefrom are not `objection` able.` To effectively disperse the` shadows cast by the members 3, the outer globe 6 maybe made of a translucent material, such, for example, as opal, which diuses the light from the,y arc and practically eliminates the shadows occasioned by interposing the members 3 between the arc and the globe 6.

During the operation ofthe lamp, the sleeve 8 which embraces `the stationary element 9 is held in the position shown by suitable means, such as a spring device 13 engaging the lower edge of the sleeve. The arms 7, which are pivoted to the upper portion of the sleeve, are disposedin longitudi nally extending recesses 14: formed in opposite sides thereof, as shown in Fig. 2, thus concealing the said arms from view` when not in use. When it is required to trim the lamp and therefore to have access to the chamber of the inner globe 5, the sleeve 8 is moved downwardly toward the base (not shown) of the post 4 by disengaging the spring 13 and permitting the sleeve to fall by reason of its weight to the position indicated by the dotted lines of Fig. 1. The

pivotally secured arms 7 are withdrawn from their recesses and raised to a position shown by the arm 7a. As the sleeve 8 is moved upwardly, the upper ends of the arms 'T engage recesses formed in lugs 15, which are irmly attached tothe condenser l10 of the lamp. Continuing` to advance the sleeve 8, the lamp is lii'ted from its supporting ring 2 and the globe 5 is withdrawn from the outer globe G. llvhenthe sleeve is locked in its initial position by rengagement with the spring 13, the lamp occupies the position shown by the broken lines in which it is accessible for making repairs, inspections and the necessary replacements.

The lugs 15 are provided with recesses 15aM which receive the ends of the arms 7 when in their raised positions.

After these functions have been performed by the inspector, the lamp is replaced in its operating position by releasing the spring 13 and permitting the sleeve 8 to slide downwardly, thereby again engaging the lamp and the ring 2 and disengaging the arms 7 Yand the lugs 15. vinasmuch as the regulating and feeding mechanisms of the lamp are inclosed in the upper portion of the lamp structure, they may be readily inspected with the'lamp' in its normal position.

1n Fig. 3, the ring 2, which normally supports the lamp, is shovvn in plan view. rThe rigid supports 3 are cast into the ring 2 and extend from its lower surface.V rlhe upper surface of the ring is linis'hed to provide a substantially airtight joint between it an( the engaged surface of the condenser element 10 of the lamp. In this manner, air currents are substantially precluded from circulating through the dead air space 12 when the are lamp is in normal position.

While I have disclosed only one embodi-` ment of my invention, it will be understood that many modilieations may be made without departing from the spirit thereof, and I desire that only such limitations shall be imposed as are indicated in the appended claims.

l claim as my invention:

1. The combination with an arc lamp, a post member, and a support thereon upon which the arc lamp normally disposed, of a sleeve slidingly engaging the post member, two arms pivotally secured. to the sleeve, and means for engaging the arms and lhe arc lamp adapting the latter to be varied in position in accordance with the posilion of the sleeve.

Q. The combination with an are lamp. a post member, and a support lhereon upon `which tl e are lamp is normally rlislmsed. olf a sleeve slidingly engaging the post member, two arms pivotally secured to the sleeve, and means for engaging the arms and the are lamp adapting the latter to be disengaged from the support.

3. The combination with an are lamp, a post member, and a support thereon upon which the are lamp is normally disposed, of a sleeve slidingly engaging the post member, tivo arms pivotally secured to the sleeve, means for engaging the arms and the arc lamp adapting the latter to be raised to a predetermined position, and means for maintaining the lamp at the predetermined position.

4. Ihe combination with an are lamp, an in ner and an out-er globe therefor, a post member, and a support Within the outer globe upon which the arc lamp normally disposed, of a sleeve slidingly engaging the post member, two arms pivotally secured to the sleeve, and means for engaging the arms and the arc lamp adapting the latter to be raised to a position outside, the outer globe.

1n testimony whereof` I have hereunto subscribed my name this 1st day of Dec.

GEORGE M. LlTTLE. Witnesses z B. B. Hines, M. C. Manz.

Copies of this patent may be obtained for ve cents each, by addressing the Gommissloner of Patent:

y Washington, D. C. 

